(3S)-2-(2,2-Diphenylacetyl)-1,2,3,4-tetrahydro-6-methoxy-5-(phenylmethoxy)-3-isoquinolinecarboxylic Acid Sodium Salt Dihydrate is a derivative of (3S)-1,2,3,4-Tetrahydro-6,7-dimethoxy-3-isoquinolinecarboxylic Acid (T293190, HCl); an intermediate in the synthesis of Moexipril (M485350, HCl) which is an angiotensin converting enzyme (ACE) inhibitor.